John was piloting a plane behind a car but was never able to overtake it. Why?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What is the next number?

77, 49, 36, 18 ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

By what process could you make a 'Tea-Table' into food?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

What has 13 hearts but no other organs?